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GOODWILL AND INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Goodwill — C hanges in the carrying amount of goodwill are as follows:
| Segment |  |
(in thousands) | Electrical |  | Safety & Infrastructure |  | Total
Balance as of September 30, 2023 | $ | 258,427 |  |  | $ | 52,679 |  |  | $ | 311,106 |
Exchange rate effects | 2,857 |  |  | 37 |  |  | 2,894 |
Balance as of September 30, 2024 | $ | 261,284 |  |  | $ | 52,716 |  |  | $ | 314,000 |
Impairment | — |  |  | (18,885) |  |  | (18,885) |
Divestiture | (755) |  |  | — |  |  | (755) |
Exchange rate effects | 314 |  |  | (189) |  |  | 125 |
Balance as of September 30, 2025 | $ | 260,843 |  |  | $ | 33,642 |  |  | $ | 294,485 |
Schedule of Finite-Lived Intangible Assets | Intangible Assets — The following table provides the gross carrying value, accumulated amortization, and net carrying value for each major class of intangible assets:
|  |  | September 30, 2025 |  | September 30, 2024
(in thousands) | Weighted Average Useful Life (Years) |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value
Amortizable Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 10 |  | $ | 401,771 |  |  | $ | (338,201) |  |  | $ | 63,570 |  |  | $ | 600,317 |  |  | $ | (371,600) |  |  | $ | 228,717 |
Other | 8 |  | 25,205 |  |  | (20,797) |  |  | 4,408 |  |  | 43,968 |  |  | (25,067) |  |  | 18,901 |
Total |  |  | 426,976 |  |  | (358,998) |  |  | 67,978 |  |  | 644,285 |  |  | (396,667) |  |  | 247,618 |
Indefinite-lived Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  |  | 92,780 |  |  | — |  |  | 92,780 |  |  | 92,813 |  |  | — |  |  | 92,813 |
Total |  |  | $ | 519,756 |  |  | $ | (358,998) |  |  | $ | 160,758 |  |  | $ | 737,098 |  |  | $ | (396,667) |  |  | $ | 340,431 |
Schedule of Indefinite-Lived Intangible Assets | Intangible Assets — The following table provides the gross carrying value, accumulated amortization, and net carrying value for each major class of intangible assets:
|  |  | September 30, 2025 |  | September 30, 2024
(in thousands) | Weighted Average Useful Life (Years) |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value
Amortizable Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 10 |  | $ | 401,771 |  |  | $ | (338,201) |  |  | $ | 63,570 |  |  | $ | 600,317 |  |  | $ | (371,600) |  |  | $ | 228,717 |
Other | 8 |  | 25,205 |  |  | (20,797) |  |  | 4,408 |  |  | 43,968 |  |  | (25,067) |  |  | 18,901 |
Total |  |  | 426,976 |  |  | (358,998) |  |  | 67,978 |  |  | 644,285 |  |  | (396,667) |  |  | 247,618 |
Indefinite-lived Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  |  | 92,780 |  |  | — |  |  | 92,780 |  |  | 92,813 |  |  | — |  |  | 92,813 |
Total |  |  | $ | 519,756 |  |  | $ | (358,998) |  |  | $ | 160,758 |  |  | $ | 737,098 |  |  | $ | (396,667) |  |  | $ | 340,431 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | Expected amortization expense for intangible assets over the next five years and thereafter is as follows (in thousands):
2026 | $ | 24,945 |
2027 | 23,949 |
2028 | 9,035 |
2029 | 2,924 |
2030 | 2,924 |
2031 and thereafter | 4,202 |

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